(In reply to Jacob from comment #161)
> The last image I tried was 3.15-rc2, which didn't crash on me during
> 18-hours of uptime

Can you try 3.15-rc2 again for even longer, to make sure it wasn't just luck?

If it's consistent, it would be really helpful if you could bisect between
3.15-rc2 and 3.15-rc3.